OpenLDAP listening only on IPv6

Hello,
I've just compiled the latest OpenLDAP v2.0 on OpenBSD 3.0, now I have
started the default install of OpenLDAP simply by running slapd but I have
a little problem: somehow OpenLDAP will only bind to the IPv6 interface and
not on the IPv4, as you can see here the output of a netstst -na | grep 389
:
tcp6 0 0 *.389 *.* LISTEN
So nothing works as I don't have IPv6 enabled ... How can I disable that or
force OpenLDAP to use IPv4 ?
Regards
Marc